Grub2 EFI: Where is my EFI partition?

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http://askubuntu.com – I have installed ubuntu 12.04 on my Thinkpad Edge (UEFI) using an USB-Stick. I guess it has been botted using EFI since a GRUB menu appeared with the options to boot a live system, install, or check the disk. When I boot my laptop, grub only shows its command line prompt "grub>". After manually running grub-install /dev/sda + update-grub within a chrooted environment it boots grub in recovery mode saying "File not found." The disk is partitioned as follows: /dev/sda1: ntfs, 1.5GB, SYSTEM DRV /dev/sda2: ntfs, 150GB, Windows7 OS /dev/sda3: extended /dev/sda6: ext4, 140GB, Ubun (HowTos)